WASHINGTON, DC: (L to R) U.S. First lady Michelle Obama and Samantha Cameron, wife of British Prime Minister David Cameron, are given a tour of an Olympics-themed event with area school children by American decathlete and Olympic gold-medal winner Dan O'Brien at American University March 13, 2012 in Washington, DC. Fifth graders from MacFarland Middle School in Washington, D.C., Manor View Elementary School in Maryland and Arlington Science Focus School in Virginia participated in a mini-Olympics competition in celebration of the 2012 London Summer Olympics and Mrs. Obama's Let's Move! initiative. (Photo by Chip Somodevilla/Getty Images)